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Comment by xucian | Hacker News Reader

has anybody doing complex projects achiever success with uv completely replacing pyenv, and had mostly pros and few or no cons?

I'm very comfortable with pyenv, but am extremely open to new stuff

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Sure, I've basically replaced pyenv, pyenv-virtualenv, poetry; with uv. I can't think about cons personally, though you might need to dig into the docs at times.

Teaching a course for a corporate client this week for data scientists. The first day (of five) we covered uv. Minds blown.

"Course was worth it just for uv"

thanks, this encourages me to explore it more

I worked in a large-ish org where 20+ python projects, their CI/CD pipelines and their docker images were migrated from `pyenv` + `.python-version` + `requirements.txt` to `uv` in basically a single day.

If you are comfortable with `pyenv`, the switch to `uv` is basically a walk in the park. The benefit is the speed + the predictable dependencies resolution.

Astral ships a Docker image that provides their tox-uv. I saw maybe a 3x speed up setting up environments.

I don't know how complex your project is but I moved my previous work from pyenv to rye(UV and rye have merged, most work is being done on uv, today I'd probably use UV)

And am currently trying to move current work to UV. The problems seem to be possibility of unknown breakage for unknown users of the old project not any known technical issue.

I'd highly reccomend UV. Its just easier/more flexible. And it downloads third party pre compiled python builds instead of the extra time and complexity to get it compiling locally. Its much nicer especially when maintaing an environment for a team that just works without them having to know about it

One downside of UV is that unlike pyenv and rye it doesn't shim python. Pyenv shim did give me some trouble but rye simples shim didn't. The workaround is to run stuff with uv run x.py instead of python x.py

`uv tool install` will create shims in .local/bin

Sorry I meant shims for python. I think I mentioned installing tools

thanks, running "uv run x.py" is a relevant downside for me, but you definitely brought me closer to actually looking into it. I'm about to sell a project template and it'd look good if I use a newer tool (as long as I'll make sure it's stable and resilient, the latter being a bit hard to estimate, thus my post)

I've used uv to work on the feast feature store project to great success

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